BIPH stands for BI-directional PHasing (BiPhase Transceiver), and reflects where this design originated. Much of the circuitry in this design has been copied (plagiarized..?) from the BITX20 transceiver designed by Farhan VU2ESE and from subsequent BITX20A modifications of that design by Dan N7VE to make the BITX20A Kit and the BITX17A Kit transceivers.